Greatly Enhanced Temperature Stability of Polypropylene Insulation Material by Introducing Symmetrical Traps and Branching Structures through Melt-Grafting of HDDA

Huiyang Zhang

doi:10.1016/j.polymdegradstab.2026.112366

Greatly Enhanced Temperature Stability of Polypropylene Insulation Material by Introducing Symmetrical Traps and Branching Structures through Melt-Grafting of HDDA

2026-07-31

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AI

H

Huiyang Zhang

Z

Zhaotong Meng *

Y

Yanbo Zheng

S

Shengkun Niu

C

Changhai Zhang

T

Tiandong Zhang *

Q

Qingguo Chi *

DOI：10.1016/j.polymdegradstab.2026.112366

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• A grafting method that simultaneously introduces an in-plane symmetric trap and a branched structure in PP has been proposed for the first time. • Significant improvements in the overall performance of PP were achieved at temperatures well above the cable's operating temperature of 120°C, the breakdown field strength and tensile strength increased by 24.6% each, while the creep strain decreased by 39.3%. • Significantly improved the performance stability of recycled PP. After 9 thermomechanical processing cycles, H-PP still retains 94.6% of its DC breakdown strength and 88.2% of its tensile strength. • The mechanisms underlying the enhancement of PP’s electrical and mechanical properties have been elucidated: the ability of symmetric traps to efficiently regulate carrier transport, and the ability of branched structures to effectively regulate molecular chain motion.

Greatly Enhanced Temperature Stability of Polypropylene Insulation Material by Introducing Symmetrical Traps and Branching Structures through Melt-Grafting of HDDA

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